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1990 Johnson 120 cooling problem

sunbird

New member
" I am having a problem with t

" I am having a problem with the engine where the port head was getting warm but the starboard head was cold. I realized this when I was flushing and the pee stream was cold. I replaced both thermostats and gaskets. I tested it on the muffs and both heads were getting warm. Then I took the boat out for a couple of hours and ran on the muffs when I got back. Now the port head is cold and the starboard head is warm. The engine has not overheated at all, if anything it is not getting warm enough. Any ideas what to check next? Thanks in advance. "
 
" Update: I ran it again this

" Update: I ran it again this weekend and same thing happened. Engine runs great but only one head gets hot. Also, I pulled of the plug wires from the cold head and there was no change in idle. What else should I check? "
 
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